CN111440409A - Spraying-free plastic and preparation method thereof - Google Patents
Spraying-free plastic and preparation method thereof Download PDFInfo
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- CN111440409A CN111440409A CN201911114998.7A CN201911114998A CN111440409A CN 111440409 A CN111440409 A CN 111440409A CN 201911114998 A CN201911114998 A CN 201911114998A CN 111440409 A CN111440409 A CN 111440409A
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Abstract
The invention relates to the field of plastic production, in particular to spraying-free plastic, which has the technical scheme that the spraying-free plastic is composed of the following components in parts by mass: 60-90 parts of ABS resin; 10-20 parts of AS resin; 20-40 parts of PC resin; 0-5 parts of foaming agent; 1-2 parts of a toughening agent; 0.5-3 parts of a dispersing agent; 2-3 parts of an antioxidant; 3-15 parts of pearl powder; 2-3 parts of carbon black; 2-3 parts of metal powder. The spraying-free plastic disclosed by the invention has good toughness, higher hardness and better pearling effect, and the bicycle pedal obtained by injection molding of the plastic is durable. The invention also discloses a production method of the spraying-free plastic, which has high production speed and good product effect.
Description
Technical Field
The invention relates to the field of plastics and plastic production, in particular to spraying-free plastic and a preparation method thereof.
Background
The spraying-free plastic is prepared by adding certain pearl powder, high gloss toner or metal powder and the like into a plastic raw material, so that the plastic after injection molding has a better color effect or has metal luster, and the workpiece after injection molding can be free from spraying paint and can meet the requirement on appearance.
In the prior art, there is a need to produce a bicycle pedal that is required to be made more lightweight, to have a better appearance, and to be durable. The bicycle pedal is made of metal materials, the bicycle pedal made of the metal materials has good appearance and good durability, but the density of the metal materials is high, so that the bicycle pedal made of the metal materials has high mass, and if light alloy materials such as titanium alloy are adopted, the production cost of the bicycle pedal can be increased. Although the bicycle pedal made of plastic has the advantage of low price, the bicycle pedal made of plastic is considered as a low-quality product by general consumers, mainly because the pedal made of plastic does not have the luster of metal products in appearance, and the hardness and the toughness of the pedal cannot meet the requirements, so that the pedal is easy to slide after being used for a long time, and is easy to break after collision and other adverse phenomena. If the appearance of the bicycle pedals is desired by simply spraying paint on the plastic pedals, the paint will peel off during use by the consumer and not remain long lasting.
Therefore, there is a need to design a spray-free plastic and a preparation method thereof to overcome the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a spraying-free plastic, the manufactured bicycle pedal meets the requirement of hardness and toughness, has a better appearance, and can avoid spraying a workpiece.
The technical purpose of the invention is realized by the following technical scheme: the spraying-free plastic is characterized by comprising the following components in parts by mass: 60-90 parts of ABS resin; 10-20 parts of AS resin; 20-40 parts of PC resin; 0-5 parts of foaming agent; 1-2 parts of a toughening agent; 0.5-3 parts of a dispersing agent; 2-3 parts of an antioxidant; 3-12 parts of pearl powder; 2-3 parts of carbon black; 2-3 parts of metal powder.
By adopting the technical scheme, the ABS resin is a terpolymer of three monomers of acrylonitrile, butadiene and styrene, has certain surface hardness, high elasticity and toughness, good comprehensive performance and low price;
the AS resin is obtained by polymerizing acrylonitrile and styrene serving AS raw materials, is colorless and transparent thermoplastic resin, has high temperature resistance, excellent glossiness and chemical medium resistance, excellent hardness, rigidity, dimensional stability and higher bearing capacity;
the PC resin is linear carbonic acid polyester, has high toughness and high flexural modulus, and can be used for manufacturing products with high requirements on hardness and toughness;
the foaming agent can lower the integral density of the plastic, and the prepared product is lighter;
the toughening agent can increase the toughness of the plastic;
the dispersing agent can enable all components in the plastic to be mixed more uniformly;
the antioxidant enables the plastic to obtain better oxidation resistance;
the plastic can obtain better appearance by the pearl powder, the carbon black and the metal powder, the step of spraying the paint on the product is omitted, and a better pearl effect is achieved;
the base material compounded by ABS, AS and PC has high hardness and enough toughness, can better meet the manufacturing requirement of the bicycle pedal, the compounding proportion of the ABS, AS and PC is a better proportion through tests, the base material compounded by the proportion has the best hardness and toughness, and the obtained product has the best effect.
The invention is further configured to: the foaming agent is EVA resin, and the content of VA in the EVA resin is 10%.
By adopting the technical scheme, the EVA is formed by copolymerizing ethylene and vinyl acetate, the vinyl acetate is abbreviated as VA, and the EVA resin with the VA content of 10% can reduce the integral crystallinity of the plastic, reduce the density of the plastic, and improve the toughness, the impact resistance and the compatibility of each component.
The invention is further configured to: the toughening agent is rosin.
By adopting the technical scheme, the rosin is rosin which can be obtained from pine trees, on one hand, the rosin can increase the toughness of the prepared plastic to a certain degree, and on the other hand, the rosin can help pearl powder and metal powder to be better mixed in the plastic, so that a better pearl effect can be obtained.
The invention is further configured to: the dispersing agent is a mixture obtained by mixing microcrystalline paraffin and butyl stearate according to the mass ratio of 1: 1.
By adopting the technical scheme, the microcrystalline paraffin is prepared in the petroleum refining process, the relative molecular weight is large, the melting point is generally lower than 100 ℃, the lubricity and the thermal stability are good, the butyl stearate is a pure white crystal and has good thermal stability, and after the microcrystalline paraffin and the butyl stearate are mixed, the pearl powder and the metal powder can be well mixed.
The invention is further configured to: the antioxidant is selected from antioxidant 1076 or antioxidant 2921.
By adopting the technical scheme, the antioxidant 1076 and the antioxidant 2921 can enhance the oxidation resistance of the base material, and particularly after the rosin is used in the formula, the addition of the antioxidant is particularly important for ensuring the toughening effect of the rosin, so that the rosin is prevented from being oxidized and losing the effect in the production process of plastics, and even the effect is reduced.
The invention is further configured to: the pearl powder is formed by coating mica sheets with TiO 2.
By adopting the technical scheme, the pearl powder is uniformly dispersed in the polymer and is in multilayer distribution parallel to the surface of a substance, the inner core is mica with low optical refractive index, the outer layer is coated with metal oxide with high refractive index, the incident light can show the pearl effect through multiple refraction and reflection as in the pearl, and the pearl powder formed by TiO2 coated mica sheets can obtain different colors by adjusting the thickness of the coating layer and the mica-based core.
The invention is further configured to: the metal powder is a mixture of silver powder and aluminum powder.
By adopting the technical scheme, the metal powder can be used as aggregate in the plastic, so that the hardness of the plastic is increased.
The invention is further configured to: the particle size of the silver powder is 20-40 mu m, the particle size of the aluminum powder is 30-50 mu m, and the silver powder and the aluminum powder are mixed according to the proportion of 3: 1.
By adopting the technical scheme, the mixture of the silver powder and the aluminum powder with the fine particle size can enable the plastic to obtain the metal luster, and tests show that the metal luster obtained by the metal powder with the particle size and the proportion is moderate in brightness and suitable for manufacturing.
Aiming at the defects in the prior art, the invention also aims to provide a preparation method of the spraying-free plastic, the prepared spraying-free plastic can meet the requirement that the bicycle pedal meets the hardness and toughness, has better appearance and can omit the spraying step.
The technical purpose of the invention is realized by the following technical scheme: a method for preparing spraying-free plastics, after batching a spraying-free plastics of any one of claims 1-8 according to the weight portion, add into the high-speed mixer and stir, thorough mixing; and (3) feeding the obtained mixture into a double-screw extruder, sufficiently mixing under the shearing action of a screw, extruding, bracing, cooling and granulating to obtain a plastic finished product.
By adopting the technical scheme, the plastic obtained by the manufacturing method has the advantages of good toughness, high hardness, good pearly luster effect, simple manufacturing process and convenience in realization, and spraying can be omitted during subsequent workpiece manufacturing.
The invention is further configured to: the stirring is carried out at the temperature of 80-90 ℃ and the rotating speed of 100-150r/min, the length-diameter ratio of the double-screw extruder is 50-60, the rotating speed of the screw is 200-300r/min, and the extrusion working temperature range of the double-screw extruder is as follows: the temperature of the first zone is 180-185 ℃, the temperature of the second zone is 200-210 ℃, the temperature of the third zone is 220-230 ℃, the temperature of the fourth zone is 225-235 ℃, the temperature of the head is 240-250 ℃, and the residence time is 3-4 min.
By adopting the technical scheme, the prepared plastic has good stability, good toughness, high hardness and good pearly luster effect.
The invention is further configured to: the plastic obtained by the method according to claims 9-10, when the bicycle pedal is manufactured by injection molding, the temperature of the mold is required to be 40-60 ℃, and the injection pressure is 400-1300 bar.
By adopting the technical scheme, the obtained bicycle pedal is high in hardness and toughness and durable.
In conclusion, the invention has the following beneficial effects:
firstly, the plastic has good toughness and higher hardness;
secondly, the pearling effect is better;
thirdly, the bicycle pedal made of the plastic through injection molding is durable in use.
Detailed Description
The present invention will be described in detail with reference to examples.
TABLE 1
Table 1 shows the product source and the model number of each component used herein.
TABLE 2
Table 2 shows the proportions of the components in examples 1 to 5 of this document. Wherein the metal powder is a mixture of silver powder and aluminum powder mixed according to the mass ratio of 3:1, the particle size of the silver powder is 20-40 μm, and the particle size of the aluminum powder is 30-50 μm; the dispersing agent is a mixture obtained by mixing microcrystalline paraffin and butyl stearate according to the mass ratio of 1: 1; the foaming agent is EVA resin, and the content of VA in the EVA resin is 10%; the toughening agent is rosin.
Preparation of examples 1 to 5:
after the spraying-free plastics are mixed according to the weight parts in the table, the materials are added into a high-speed mixer to be stirred and fully mixed; and (3) feeding the obtained mixture into a double-screw extruder, sufficiently mixing under the shearing action of a screw, extruding, bracing, cooling and granulating to obtain a plastic finished product.
Wherein, the stirring is carried out at the temperature of 80-90 ℃ and the rotating speed of 100-150r/min, the length-diameter ratio of the double-screw extruder is 50-60, the rotating speed of the screw is 200-300r/min, and the extrusion working temperature range of the double-screw extruder is as follows: the temperature of the first zone is 180-185 ℃, the temperature of the second zone is 200-210 ℃, the temperature of the third zone is 220-230 ℃, the temperature of the fourth zone is 225-235 ℃, the temperature of the head is 240-250 ℃, and the residence time is 3-4 min.
When the plastic is used for manufacturing the bicycle pedal: the temperature of the mould is required to be 40-60 ℃, the temperature of the runner is required to be 180-220 ℃, and the injection pressure can be 400-1300 bar.
The bicycle pedal made of the plastic has the advantages of high hardness, good toughness, durability and good pearling effect.
The base material prepared by compounding and mixing the ABS, the AS and the PC has higher hardness and enough toughness, can better meet the manufacturing requirement of the bicycle pedal, the compounding proportion of the ABS, the AS and the PC is a better proportion through tests, the base material compounded by the proportion has the best hardness and toughness, and the prepared product has the best effect.
TABLE 3
Table 3 shows the mass ratio of two experimental examples and three comparative examples, which are prepared by compounding and mixing ABS, AS, and PC to obtain a substrate with superior performance, respectively, color masterbatches were prepared according to the manufacturing methods of examples 1 to 5, and then injection-molded into pedals AS in examples 1 to 5, the pedals obtained in experimental examples 1 to 2 and comparative examples 1 to 3 were submitted to inspection, the inspection mechanism was shenzhen meixin inspection gmbh, and the obtained data were AS follows:
TABLE 4
As can be seen from table 4:
1. the PC resin is added, so that the impact strength can be improved;
2. absent ABS resin, both tensile and flexural strength are severely reduced;
3. as can be seen from the comparison between Experimental example 1 and Experimental example 2, the increase of the proportion of AS slightly increases the tensile strength and the bending strength, but slightly decreases the impact strength;
4. it can be seen from the whole table that the tensile strength, the bending strength, the impact strength and the surface hardness can be integrally enhanced by compounding the ABS, the AS and the PC.
At the same time, the plastics of examples 1 to 5 were submitted for inspection.
TABLE 5
It can be seen that:
1. comparing examples 1-5 with experimental examples 1-2, it can be seen that the addition of the toughening agent can increase the toughness of the bicycle pedal to some extent, mainly in the improvement of tensile strength, bending strength and impact strength.
2. Comparing examples 1-2 with examples 3-4, the addition of the foaming agent can improve the toughness of the product to some extent, mainly in terms of improvement of tensile strength, bending strength and impact strength, but the surface hardness is reduced correspondingly, the surface hardness can also meet the requirement, and the bicycle pedal obtained by adopting examples 3-5 has better toughness.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The spraying-free plastic is characterized by comprising the following components in parts by mass:
60-90 parts of ABS resin;
10-20 parts of AS resin;
20-40 parts of PC resin;
0-5 parts of foaming agent;
1-2 parts of a toughening agent;
0.5-3 parts of a dispersing agent;
2-3 parts of an antioxidant;
3-15 parts of pearl powder;
2-3 parts of carbon black;
2-3 parts of metal powder.
2. The spray-free plastic according to claim 1, wherein: the foaming agent is EVA resin, and the content of VA in the EVA resin is 10%.
3. The spray-free plastic according to claim 1, wherein: the toughening agent is rosin.
4. The spray-free plastic according to claim 1, wherein: the dispersing agent is a mixture obtained by mixing microcrystalline paraffin and butyl stearate according to the mass ratio of 1: 1.
5. The spray-free plastic according to claim 1, wherein: the antioxidant is selected from antioxidant 1076 or antioxidant 2921.
6. The spray-free plastic according to claim 1, wherein: the pearl powder is formed by coating mica sheets with TiO 2.
7. The spray-free plastic according to claim 1, wherein: the metal powder is a mixture of silver powder and aluminum powder.
8. The spray-free plastic according to claim 7, wherein: the particle size of the silver powder is 20-40 mu m, the particle size of the aluminum powder is 30-50 mu m, and the silver powder and the aluminum powder are mixed according to the proportion of 3: 1.
9. A preparation method of spraying-free plastic is characterized by comprising the following steps: the spraying-free plastic of any one of claims 1-8 is added into a high-speed mixer to be stirred and fully mixed after being mixed according to the parts by weight; and (3) feeding the obtained mixture into a double-screw extruder, sufficiently mixing under the shearing action of a screw, extruding, bracing, cooling and granulating to obtain a plastic finished product.
10. The method for preparing the spraying-free plastic according to claim 9, which is characterized in that: the stirring is carried out at the temperature of 80-90 ℃ and the rotating speed of 100-150r/min, the length-diameter ratio of the double-screw extruder is 50-60, the rotating speed of the screw is 200-300r/min, and the extrusion working temperature range of the double-screw extruder is as follows: the temperature of the first zone is 180-185 ℃, the temperature of the second zone is 200-210 ℃, the temperature of the third zone is 220-230 ℃, the temperature of the fourth zone is 225-235 ℃, the temperature of the head is 240-250 ℃, and the residence time is 3-4 min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113172849A (en) * | 2021-05-06 | 2021-07-27 | 东莞市久磐塑胶有限公司 | Spraying-free plastic, forming device for production and forming method |
| CN113861661A (en) * | 2021-09-28 | 2021-12-31 | 浙江联洋新材料股份有限公司 | Fiber-reinforced high-molecular rigid foam and production process thereof |
| CN114031920A (en) * | 2021-11-29 | 2022-02-11 | 上海金发科技发展有限公司 | Spraying-free halogen-free flame-retardant PC/ABS alloy and preparation method and application thereof |
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| CN107446336A (en) * | 2017-09-08 | 2017-12-08 | 太仓市华鼎塑料有限公司 | A kind of low smell exempts to spray PC/ABS materials and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172849A (en) * | 2021-05-06 | 2021-07-27 | 东莞市久磐塑胶有限公司 | Spraying-free plastic, forming device for production and forming method |
| CN113861661A (en) * | 2021-09-28 | 2021-12-31 | 浙江联洋新材料股份有限公司 | Fiber-reinforced high-molecular rigid foam and production process thereof |
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